1/* 2 * linux/drivers/video/omap2/dss/manager.c 3 * 4 * Copyright (C) 2009 Nokia Corporation 5 * Author: Tomi Valkeinen <tomi.valkeinen@nokia.com> 6 * 7 * Some code and ideas taken from drivers/video/omap/ driver 8 * by Imre Deak. 9 * 10 * This program is free software; you can redistribute it and/or modify it 11 * under the terms of the GNU General Public License version 2 as published by 12 * the Free Software Foundation. 13 * 14 * This program is distributed in the hope that it will be useful, but WITHOUT 15 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 16 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 17 * more details. 18 * 19 * You should have received a copy of the GNU General Public License along with 20 * this program. If not, see <http://www.gnu.org/licenses/>. 21 */ 22 23#define DSS_SUBSYS_NAME "MANAGER" 24 25#include <linux/kernel.h> 26#include <linux/slab.h> 27#include <linux/module.h> 28#include <linux/platform_device.h> 29#include <linux/spinlock.h> 30#include <linux/jiffies.h> 31 32#include <plat/display.h> 33#include <plat/cpu.h> 34 35#include "dss.h" 36 37static int num_managers; 38static struct list_head manager_list; 39 40static ssize_t manager_name_show(struct omap_overlay_manager *mgr, char *buf) 41{ 42 return snprintf(buf, PAGE_SIZE, "%s\n", mgr->name); 43} 44 45static ssize_t manager_display_show(struct omap_overlay_manager *mgr, char *buf) 46{ 47 return snprintf(buf, PAGE_SIZE, "%s\n", 48 mgr->device ? mgr->device->name : "<none>"); 49} 50 51static ssize_t manager_display_store(struct omap_overlay_manager *mgr, 52 const char *buf, size_t size) 53{ 54 int r = 0; 55 size_t len = size; 56 struct omap_dss_device *dssdev = NULL; 57 58 int match(struct omap_dss_device *dssdev, void *data) 59 { 60 const char *str = data; 61 return sysfs_streq(dssdev->name, str); 62 } 63 64 if (buf[size-1] == '\n') 65 --len; 66 67 if (len > 0) 68 dssdev = omap_dss_find_device((void *)buf, match); 69 70 if (len > 0 && dssdev == NULL) 71 return -EINVAL; 72 73 if (dssdev) 74 DSSDBG("display %s found\n", dssdev->name); 75 76 if (mgr->device) { 77 r = mgr->unset_device(mgr); 78 if (r) { 79 DSSERR("failed to unset display\n"); 80 goto put_device; 81 } 82 } 83 84 if (dssdev) { 85 r = mgr->set_device(mgr, dssdev); 86 if (r) { 87 DSSERR("failed to set manager\n"); 88 goto put_device; 89 } 90 91 r = mgr->apply(mgr); 92 if (r) { 93 DSSERR("failed to apply dispc config\n"); 94 goto put_device; 95 } 96 } 97 98put_device: 99 if (dssdev) 100 omap_dss_put_device(dssdev); 101 102 return r ? r : size; 103} 104 105static ssize_t manager_default_color_show(struct omap_overlay_manager *mgr, 106 char *buf) 107{ 108 return snprintf(buf, PAGE_SIZE, "%d\n", mgr->info.default_color); 109} 110 111static ssize_t manager_default_color_store(struct omap_overlay_manager *mgr, 112 const char *buf, size_t size) 113{ 114 struct omap_overlay_manager_info info; 115 u32 color; 116 int r; 117 118 if (sscanf(buf, "%d", &color) != 1) 119 return -EINVAL; 120 121 mgr->get_manager_info(mgr, &info); 122 123 info.default_color = color; 124 125 r = mgr->set_manager_info(mgr, &info); 126 if (r) 127 return r; 128 129 r = mgr->apply(mgr); 130 if (r) 131 return r; 132 133 return size; 134} 135 136static const char *trans_key_type_str[] = { 137 "gfx-destination", 138 "video-source", 139}; 140 141static ssize_t manager_trans_key_type_show(struct omap_overlay_manager *mgr, 142 char *buf) 143{ 144 enum omap_dss_trans_key_type key_type; 145 146 key_type = mgr->info.trans_key_type; 147 BUG_ON(key_type >= ARRAY_SIZE(trans_key_type_str)); 148 149 return snprintf(buf, PAGE_SIZE, "%s\n", trans_key_type_str[key_type]); 150} 151 152static ssize_t manager_trans_key_type_store(struct omap_overlay_manager *mgr, 153 const char *buf, size_t size) 154{ 155 enum omap_dss_trans_key_type key_type; 156 struct omap_overlay_manager_info info; 157 int r; 158 159 for (key_type = OMAP_DSS_COLOR_KEY_GFX_DST; 160 key_type < ARRAY_SIZE(trans_key_type_str); key_type++) { 161 if (sysfs_streq(buf, trans_key_type_str[key_type])) 162 break; 163 } 164 165 if (key_type == ARRAY_SIZE(trans_key_type_str)) 166 return -EINVAL; 167 168 mgr->get_manager_info(mgr, &info); 169 170 info.trans_key_type = key_type; 171 172 r = mgr->set_manager_info(mgr, &info); 173 if (r) 174 return r; 175 176 r = mgr->apply(mgr); 177 if (r) 178 return r; 179 180 return size; 181} 182 183static ssize_t manager_trans_key_value_show(struct omap_overlay_manager *mgr, 184 char *buf) 185{ 186 return snprintf(buf, PAGE_SIZE, "%d\n", mgr->info.trans_key); 187} 188 189static ssize_t manager_trans_key_value_store(struct omap_overlay_manager *mgr, 190 const char *buf, size_t size) 191{ 192 struct omap_overlay_manager_info info; 193 u32 key_value; 194 int r; 195 196 if (sscanf(buf, "%d", &key_value) != 1) 197 return -EINVAL; 198 199 mgr->get_manager_info(mgr, &info); 200 201 info.trans_key = key_value; 202 203 r = mgr->set_manager_info(mgr, &info); 204 if (r) 205 return r; 206 207 r = mgr->apply(mgr); 208 if (r) 209 return r; 210 211 return size; 212} 213 214static ssize_t manager_trans_key_enabled_show(struct omap_overlay_manager *mgr, 215 char *buf) 216{ 217 return snprintf(buf, PAGE_SIZE, "%d\n", mgr->info.trans_enabled); 218} 219 220static ssize_t manager_trans_key_enabled_store(struct omap_overlay_manager *mgr, 221 const char *buf, size_t size) 222{ 223 struct omap_overlay_manager_info info; 224 int enable; 225 int r; 226 227 if (sscanf(buf, "%d", &enable) != 1) 228 return -EINVAL; 229 230 mgr->get_manager_info(mgr, &info); 231 232 info.trans_enabled = enable ? true : false; 233 234 r = mgr->set_manager_info(mgr, &info); 235 if (r) 236 return r; 237 238 r = mgr->apply(mgr); 239 if (r) 240 return r; 241 242 return size; 243} 244 245static ssize_t manager_alpha_blending_enabled_show( 246 struct omap_overlay_manager *mgr, char *buf) 247{ 248 return snprintf(buf, PAGE_SIZE, "%d\n", mgr->info.alpha_enabled); 249} 250 251static ssize_t manager_alpha_blending_enabled_store( 252 struct omap_overlay_manager *mgr, 253 const char *buf, size_t size) 254{ 255 struct omap_overlay_manager_info info; 256 int enable; 257 int r; 258 259 if (sscanf(buf, "%d", &enable) != 1) 260 return -EINVAL; 261 262 mgr->get_manager_info(mgr, &info); 263 264 info.alpha_enabled = enable ? true : false; 265 266 r = mgr->set_manager_info(mgr, &info); 267 if (r) 268 return r; 269 270 r = mgr->apply(mgr); 271 if (r) 272 return r; 273 274 return size; 275} 276 277struct manager_attribute { 278 struct attribute attr; 279 ssize_t (*show)(struct omap_overlay_manager *, char *); 280 ssize_t (*store)(struct omap_overlay_manager *, const char *, size_t); 281}; 282 283#define MANAGER_ATTR(_name, _mode, _show, _store) \ 284 struct manager_attribute manager_attr_##_name = \ 285 __ATTR(_name, _mode, _show, _store) 286 287static MANAGER_ATTR(name, S_IRUGO, manager_name_show, NULL); 288static MANAGER_ATTR(display, S_IRUGO|S_IWUSR, 289 manager_display_show, manager_display_store); 290static MANAGER_ATTR(default_color, S_IRUGO|S_IWUSR, 291 manager_default_color_show, manager_default_color_store); 292static MANAGER_ATTR(trans_key_type, S_IRUGO|S_IWUSR, 293 manager_trans_key_type_show, manager_trans_key_type_store); 294static MANAGER_ATTR(trans_key_value, S_IRUGO|S_IWUSR, 295 manager_trans_key_value_show, manager_trans_key_value_store); 296static MANAGER_ATTR(trans_key_enabled, S_IRUGO|S_IWUSR, 297 manager_trans_key_enabled_show, 298 manager_trans_key_enabled_store); 299static MANAGER_ATTR(alpha_blending_enabled, S_IRUGO|S_IWUSR, 300 manager_alpha_blending_enabled_show, 301 manager_alpha_blending_enabled_store); 302 303 304static struct attribute *manager_sysfs_attrs[] = { 305 &manager_attr_name.attr, 306 &manager_attr_display.attr, 307 &manager_attr_default_color.attr, 308 &manager_attr_trans_key_type.attr, 309 &manager_attr_trans_key_value.attr, 310 &manager_attr_trans_key_enabled.attr, 311 &manager_attr_alpha_blending_enabled.attr, 312 NULL 313}; 314 315static ssize_t manager_attr_show(struct kobject *kobj, struct attribute *attr, 316 char *buf) 317{ 318 struct omap_overlay_manager *manager; 319 struct manager_attribute *manager_attr; 320 321 manager = container_of(kobj, struct omap_overlay_manager, kobj); 322 manager_attr = container_of(attr, struct manager_attribute, attr); 323 324 if (!manager_attr->show) 325 return -ENOENT; 326 327 return manager_attr->show(manager, buf); 328} 329 330static ssize_t manager_attr_store(struct kobject *kobj, struct attribute *attr, 331 const char *buf, size_t size) 332{ 333 struct omap_overlay_manager *manager; 334 struct manager_attribute *manager_attr; 335 336 manager = container_of(kobj, struct omap_overlay_manager, kobj); 337 manager_attr = container_of(attr, struct manager_attribute, attr); 338 339 if (!manager_attr->store) 340 return -ENOENT; 341 342 return manager_attr->store(manager, buf, size); 343} 344 345static const struct sysfs_ops manager_sysfs_ops = { 346 .show = manager_attr_show, 347 .store = manager_attr_store, 348}; 349 350static struct kobj_type manager_ktype = { 351 .sysfs_ops = &manager_sysfs_ops, 352 .default_attrs = manager_sysfs_attrs, 353}; 354 355/* 356 * We have 4 levels of cache for the dispc settings. First two are in SW and 357 * the latter two in HW. 358 * 359 * +--------------------+ 360 * |overlay/manager_info| 361 * +--------------------+ 362 * v 363 * apply() 364 * v 365 * +--------------------+ 366 * | dss_cache | 367 * +--------------------+ 368 * v 369 * configure() 370 * v 371 * +--------------------+ 372 * | shadow registers | 373 * +--------------------+ 374 * v 375 * VFP or lcd/digit_enable 376 * v 377 * +--------------------+ 378 * | registers | 379 * +--------------------+ 380 */ 381 382struct overlay_cache_data { 383 /* If true, cache changed, but not written to shadow registers. Set 384 * in apply(), cleared when registers written. */ 385 bool dirty; 386 /* If true, shadow registers contain changed values not yet in real 387 * registers. Set when writing to shadow registers, cleared at 388 * VSYNC/EVSYNC */ 389 bool shadow_dirty; 390 391 bool enabled; 392 393 u32 paddr; 394 void __iomem *vaddr; 395 u16 screen_width; 396 u16 width; 397 u16 height; 398 enum omap_color_mode color_mode; 399 u8 rotation; 400 enum omap_dss_rotation_type rotation_type; 401 bool mirror; 402 403 u16 pos_x; 404 u16 pos_y; 405 u16 out_width; /* if 0, out_width == width */ 406 u16 out_height; /* if 0, out_height == height */ 407 u8 global_alpha; 408 409 enum omap_channel channel; 410 bool replication; 411 bool ilace; 412 413 enum omap_burst_size burst_size; 414 u32 fifo_low; 415 u32 fifo_high; 416 417 bool manual_update; 418}; 419 420struct manager_cache_data { 421 /* If true, cache changed, but not written to shadow registers. Set 422 * in apply(), cleared when registers written. */ 423 bool dirty; 424 /* If true, shadow registers contain changed values not yet in real 425 * registers. Set when writing to shadow registers, cleared at 426 * VSYNC/EVSYNC */ 427 bool shadow_dirty; 428 429 u32 default_color; 430 431 enum omap_dss_trans_key_type trans_key_type; 432 u32 trans_key; 433 bool trans_enabled; 434 435 bool alpha_enabled; 436 437 bool manual_upd_display; 438 bool manual_update; 439 bool do_manual_update; 440 441 /* manual update region */ 442 u16 x, y, w, h; 443 444 /* enlarge the update area if the update area contains scaled 445 * overlays */ 446 bool enlarge_update_area; 447}; 448 449static struct { 450 spinlock_t lock; 451 struct overlay_cache_data overlay_cache[3]; 452 struct manager_cache_data manager_cache[2]; 453 454 bool irq_enabled; 455} dss_cache; 456 457 458 459static int omap_dss_set_device(struct omap_overlay_manager *mgr, 460 struct omap_dss_device *dssdev) 461{ 462 int i; 463 int r; 464 465 if (dssdev->manager) { 466 DSSERR("display '%s' already has a manager '%s'\n", 467 dssdev->name, dssdev->manager->name); 468 return -EINVAL; 469 } 470 471 if ((mgr->supported_displays & dssdev->type) == 0) { 472 DSSERR("display '%s' does not support manager '%s'\n", 473 dssdev->name, mgr->name); 474 return -EINVAL; 475 } 476 477 for (i = 0; i < mgr->num_overlays; i++) { 478 struct omap_overlay *ovl = mgr->overlays[i]; 479 480 if (ovl->manager != mgr || !ovl->info.enabled) 481 continue; 482 483 r = dss_check_overlay(ovl, dssdev); 484 if (r) 485 return r; 486 } 487 488 dssdev->manager = mgr; 489 mgr->device = dssdev; 490 mgr->device_changed = true; 491 492 return 0; 493} 494 495static int omap_dss_unset_device(struct omap_overlay_manager *mgr) 496{ 497 if (!mgr->device) { 498 DSSERR("failed to unset display, display not set.\n"); 499 return -EINVAL; 500 } 501 502 mgr->device->manager = NULL; 503 mgr->device = NULL; 504 mgr->device_changed = true; 505 506 return 0; 507} 508 509static int dss_mgr_wait_for_vsync(struct omap_overlay_manager *mgr) 510{ 511 unsigned long timeout = msecs_to_jiffies(500); 512 u32 irq; 513 514 if (mgr->device->type == OMAP_DISPLAY_TYPE_VENC) 515 irq = DISPC_IRQ_EVSYNC_ODD; 516 else 517 irq = DISPC_IRQ_VSYNC; 518 519 return omap_dispc_wait_for_irq_interruptible_timeout(irq, timeout); 520} 521 522static int dss_mgr_wait_for_go(struct omap_overlay_manager *mgr) 523{ 524 unsigned long timeout = msecs_to_jiffies(500); 525 struct manager_cache_data *mc; 526 enum omap_channel channel; 527 u32 irq; 528 int r; 529 int i; 530 struct omap_dss_device *dssdev = mgr->device; 531 532 if (!dssdev || dssdev->state != OMAP_DSS_DISPLAY_ACTIVE) 533 return 0; 534 535 if (dssdev->type == OMAP_DISPLAY_TYPE_VENC) { 536 irq = DISPC_IRQ_EVSYNC_ODD | DISPC_IRQ_EVSYNC_EVEN; 537 channel = OMAP_DSS_CHANNEL_DIGIT; 538 } else { 539 if (dssdev->caps & OMAP_DSS_DISPLAY_CAP_MANUAL_UPDATE) { 540 enum omap_dss_update_mode mode; 541 mode = dssdev->driver->get_update_mode(dssdev); 542 if (mode != OMAP_DSS_UPDATE_AUTO) 543 return 0; 544 545 irq = DISPC_IRQ_FRAMEDONE; 546 } else { 547 irq = DISPC_IRQ_VSYNC; 548 } 549 channel = OMAP_DSS_CHANNEL_LCD; 550 } 551 552 mc = &dss_cache.manager_cache[mgr->id]; 553 i = 0; 554 while (1) { 555 unsigned long flags; 556 bool shadow_dirty, dirty; 557 558 spin_lock_irqsave(&dss_cache.lock, flags); 559 dirty = mc->dirty; 560 shadow_dirty = mc->shadow_dirty; 561 spin_unlock_irqrestore(&dss_cache.lock, flags); 562 563 if (!dirty && !shadow_dirty) { 564 r = 0; 565 break; 566 } 567 568 /* 4 iterations is the worst case: 569 * 1 - initial iteration, dirty = true (between VFP and VSYNC) 570 * 2 - first VSYNC, dirty = true 571 * 3 - dirty = false, shadow_dirty = true 572 * 4 - shadow_dirty = false */ 573 if (i++ == 3) { 574 DSSERR("mgr(%d)->wait_for_go() not finishing\n", 575 mgr->id); 576 r = 0; 577 break; 578 } 579 580 r = omap_dispc_wait_for_irq_interruptible_timeout(irq, timeout); 581 if (r == -ERESTARTSYS) 582 break; 583 584 if (r) { 585 DSSERR("mgr(%d)->wait_for_go() timeout\n", mgr->id); 586 break; 587 } 588 } 589 590 return r; 591} 592 593int dss_mgr_wait_for_go_ovl(struct omap_overlay *ovl) 594{ 595 unsigned long timeout = msecs_to_jiffies(500); 596 enum omap_channel channel; 597 struct overlay_cache_data *oc; 598 struct omap_dss_device *dssdev; 599 u32 irq; 600 int r; 601 int i; 602 603 if (!ovl->manager) 604 return 0; 605 606 dssdev = ovl->manager->device; 607 608 if (!dssdev || dssdev->state != OMAP_DSS_DISPLAY_ACTIVE) 609 return 0; 610 611 if (dssdev->type == OMAP_DISPLAY_TYPE_VENC) { 612 irq = DISPC_IRQ_EVSYNC_ODD | DISPC_IRQ_EVSYNC_EVEN; 613 channel = OMAP_DSS_CHANNEL_DIGIT; 614 } else { 615 if (dssdev->caps & OMAP_DSS_DISPLAY_CAP_MANUAL_UPDATE) { 616 enum omap_dss_update_mode mode; 617 mode = dssdev->driver->get_update_mode(dssdev); 618 if (mode != OMAP_DSS_UPDATE_AUTO) 619 return 0; 620 621 irq = DISPC_IRQ_FRAMEDONE; 622 } else { 623 irq = DISPC_IRQ_VSYNC; 624 } 625 channel = OMAP_DSS_CHANNEL_LCD; 626 } 627 628 oc = &dss_cache.overlay_cache[ovl->id]; 629 i = 0; 630 while (1) { 631 unsigned long flags; 632 bool shadow_dirty, dirty; 633 634 spin_lock_irqsave(&dss_cache.lock, flags); 635 dirty = oc->dirty; 636 shadow_dirty = oc->shadow_dirty; 637 spin_unlock_irqrestore(&dss_cache.lock, flags); 638 639 if (!dirty && !shadow_dirty) { 640 r = 0; 641 break; 642 } 643 644 /* 4 iterations is the worst case: 645 * 1 - initial iteration, dirty = true (between VFP and VSYNC) 646 * 2 - first VSYNC, dirty = true 647 * 3 - dirty = false, shadow_dirty = true 648 * 4 - shadow_dirty = false */ 649 if (i++ == 3) { 650 DSSERR("ovl(%d)->wait_for_go() not finishing\n", 651 ovl->id); 652 r = 0; 653 break; 654 } 655 656 r = omap_dispc_wait_for_irq_interruptible_timeout(irq, timeout); 657 if (r == -ERESTARTSYS) 658 break; 659 660 if (r) { 661 DSSERR("ovl(%d)->wait_for_go() timeout\n", ovl->id); 662 break; 663 } 664 } 665 666 return r; 667} 668 669static int overlay_enabled(struct omap_overlay *ovl) 670{ 671 return ovl->info.enabled && ovl->manager && ovl->manager->device; 672} 673 674/* Is rect1 a subset of rect2? */ 675static bool rectangle_subset(int x1, int y1, int w1, int h1, 676 int x2, int y2, int w2, int h2) 677{ 678 if (x1 < x2 || y1 < y2) 679 return false; 680 681 if (x1 + w1 > x2 + w2) 682 return false; 683 684 if (y1 + h1 > y2 + h2) 685 return false; 686 687 return true; 688} 689 690/* Do rect1 and rect2 overlap? */ 691static bool rectangle_intersects(int x1, int y1, int w1, int h1, 692 int x2, int y2, int w2, int h2) 693{ 694 if (x1 >= x2 + w2) 695 return false; 696 697 if (x2 >= x1 + w1) 698 return false; 699 700 if (y1 >= y2 + h2) 701 return false; 702 703 if (y2 >= y1 + h1) 704 return false; 705 706 return true; 707} 708 709static bool dispc_is_overlay_scaled(struct overlay_cache_data *oc) 710{ 711 if (oc->out_width != 0 && oc->width != oc->out_width) 712 return true; 713 714 if (oc->out_height != 0 && oc->height != oc->out_height) 715 return true; 716 717 return false; 718} 719 720static int configure_overlay(enum omap_plane plane) 721{ 722 struct overlay_cache_data *c; 723 struct manager_cache_data *mc; 724 u16 outw, outh; 725 u16 x, y, w, h; 726 u32 paddr; 727 int r; 728 u16 orig_w, orig_h, orig_outw, orig_outh; 729 730 DSSDBGF("%d", plane); 731 732 c = &dss_cache.overlay_cache[plane]; 733 734 if (!c->enabled) { 735 dispc_enable_plane(plane, 0); 736 return 0; 737 } 738 739 mc = &dss_cache.manager_cache[c->channel]; 740 741 x = c->pos_x; 742 y = c->pos_y; 743 w = c->width; 744 h = c->height; 745 outw = c->out_width == 0 ? c->width : c->out_width; 746 outh = c->out_height == 0 ? c->height : c->out_height; 747 paddr = c->paddr; 748 749 orig_w = w; 750 orig_h = h; 751 orig_outw = outw; 752 orig_outh = outh; 753 754 if (c->manual_update && mc->do_manual_update) { 755 unsigned bpp; 756 unsigned scale_x_m = w, scale_x_d = outw; 757 unsigned scale_y_m = h, scale_y_d = outh; 758 759 /* If the overlay is outside the update region, disable it */ 760 if (!rectangle_intersects(mc->x, mc->y, mc->w, mc->h, 761 x, y, outw, outh)) { 762 dispc_enable_plane(plane, 0); 763 return 0; 764 } 765 766 switch (c->color_mode) { 767 case OMAP_DSS_COLOR_RGB16: 768 case OMAP_DSS_COLOR_ARGB16: 769 case OMAP_DSS_COLOR_YUV2: 770 case OMAP_DSS_COLOR_UYVY: 771 bpp = 16; 772 break; 773 774 case OMAP_DSS_COLOR_RGB24P: 775 bpp = 24; 776 break; 777 778 case OMAP_DSS_COLOR_RGB24U: 779 case OMAP_DSS_COLOR_ARGB32: 780 case OMAP_DSS_COLOR_RGBA32: 781 case OMAP_DSS_COLOR_RGBX32: 782 bpp = 32; 783 break; 784 785 default: 786 BUG(); 787 } 788 789 if (mc->x > c->pos_x) { 790 x = 0; 791 outw -= (mc->x - c->pos_x); 792 paddr += (mc->x - c->pos_x) * 793 scale_x_m / scale_x_d * bpp / 8; 794 } else { 795 x = c->pos_x - mc->x; 796 } 797 798 if (mc->y > c->pos_y) { 799 y = 0; 800 outh -= (mc->y - c->pos_y); 801 paddr += (mc->y - c->pos_y) * 802 scale_y_m / scale_y_d * 803 c->screen_width * bpp / 8; 804 } else { 805 y = c->pos_y - mc->y; 806 } 807 808 if (mc->w < (x + outw)) 809 outw -= (x + outw) - (mc->w); 810 811 if (mc->h < (y + outh)) 812 outh -= (y + outh) - (mc->h); 813 814 w = w * outw / orig_outw; 815 h = h * outh / orig_outh; 816 817 /* YUV mode overlay's input width has to be even and the 818 * algorithm above may adjust the width to be odd. 819 * 820 * Here we adjust the width if needed, preferring to increase 821 * the width if the original width was bigger. 822 */ 823 if ((w & 1) && 824 (c->color_mode == OMAP_DSS_COLOR_YUV2 || 825 c->color_mode == OMAP_DSS_COLOR_UYVY)) { 826 if (orig_w > w) 827 w += 1; 828 else 829 w -= 1; 830 } 831 } 832 833 r = dispc_setup_plane(plane, 834 paddr, 835 c->screen_width, 836 x, y, 837 w, h, 838 outw, outh, 839 c->color_mode, 840 c->ilace, 841 c->rotation_type, 842 c->rotation, 843 c->mirror, 844 c->global_alpha); 845 846 if (r) { 847 /* this shouldn't happen */ 848 DSSERR("dispc_setup_plane failed for ovl %d\n", plane); 849 dispc_enable_plane(plane, 0); 850 return r; 851 } 852 853 dispc_enable_replication(plane, c->replication); 854 855 dispc_set_burst_size(plane, c->burst_size); 856 dispc_setup_plane_fifo(plane, c->fifo_low, c->fifo_high); 857 858 dispc_enable_plane(plane, 1); 859 860 return 0; 861} 862 863static void configure_manager(enum omap_channel channel) 864{ 865 struct manager_cache_data *c; 866 867 DSSDBGF("%d", channel); 868 869 c = &dss_cache.manager_cache[channel]; 870 871 dispc_set_default_color(channel, c->default_color); 872 dispc_set_trans_key(channel, c->trans_key_type, c->trans_key); 873 dispc_enable_trans_key(channel, c->trans_enabled); 874 dispc_enable_alpha_blending(channel, c->alpha_enabled); 875} 876 877/* configure_dispc() tries to write values from cache to shadow registers. 878 * It writes only to those managers/overlays that are not busy. 879 * returns 0 if everything could be written to shadow registers. 880 * returns 1 if not everything could be written to shadow registers. */ 881static int configure_dispc(void) 882{ 883 struct overlay_cache_data *oc; 884 struct manager_cache_data *mc; 885 const int num_ovls = ARRAY_SIZE(dss_cache.overlay_cache); 886 const int num_mgrs = ARRAY_SIZE(dss_cache.manager_cache); 887 int i; 888 int r; 889 bool mgr_busy[2]; 890 bool mgr_go[2]; 891 bool busy; 892 893 r = 0; 894 busy = false; 895 896 mgr_busy[0] = dispc_go_busy(0); 897 mgr_busy[1] = dispc_go_busy(1); 898 mgr_go[0] = false; 899 mgr_go[1] = false; 900 901 /* Commit overlay settings */ 902 for (i = 0; i < num_ovls; ++i) { 903 oc = &dss_cache.overlay_cache[i]; 904 mc = &dss_cache.manager_cache[oc->channel]; 905 906 if (!oc->dirty) 907 continue; 908 909 if (oc->manual_update && !mc->do_manual_update) 910 continue; 911 912 if (mgr_busy[oc->channel]) { 913 busy = true; 914 continue; 915 } 916 917 r = configure_overlay(i); 918 if (r) 919 DSSERR("configure_overlay %d failed\n", i); 920 921 oc->dirty = false; 922 oc->shadow_dirty = true; 923 mgr_go[oc->channel] = true; 924 } 925 926 /* Commit manager settings */ 927 for (i = 0; i < num_mgrs; ++i) { 928 mc = &dss_cache.manager_cache[i]; 929 930 if (!mc->dirty) 931 continue; 932 933 if (mc->manual_update && !mc->do_manual_update) 934 continue; 935 936 if (mgr_busy[i]) { 937 busy = true; 938 continue; 939 } 940 941 configure_manager(i); 942 mc->dirty = false; 943 mc->shadow_dirty = true; 944 mgr_go[i] = true; 945 } 946 947 /* set GO */ 948 for (i = 0; i < num_mgrs; ++i) { 949 mc = &dss_cache.manager_cache[i]; 950 951 if (!mgr_go[i]) 952 continue; 953 954 /* We don't need GO with manual update display. LCD iface will 955 * always be turned off after frame, and new settings will be 956 * taken in to use at next update */ 957 if (!mc->manual_upd_display) 958 dispc_go(i); 959 } 960 961 if (busy) 962 r = 1; 963 else 964 r = 0; 965 966 return r; 967} 968 969/* Make the coordinates even. There are some strange problems with OMAP and 970 * partial DSI update when the update widths are odd. */ 971static void make_even(u16 *x, u16 *w) 972{ 973 u16 x1, x2; 974 975 x1 = *x; 976 x2 = *x + *w; 977 978 x1 &= ~1; 979 x2 = ALIGN(x2, 2); 980 981 *x = x1; 982 *w = x2 - x1; 983} 984 985/* Configure dispc for partial update. Return possibly modified update 986 * area */ 987void dss_setup_partial_planes(struct omap_dss_device *dssdev, 988 u16 *xi, u16 *yi, u16 *wi, u16 *hi, bool enlarge_update_area) 989{ 990 struct overlay_cache_data *oc; 991 struct manager_cache_data *mc; 992 const int num_ovls = ARRAY_SIZE(dss_cache.overlay_cache); 993 struct omap_overlay_manager *mgr; 994 int i; 995 u16 x, y, w, h; 996 unsigned long flags; 997 bool area_changed; 998 999 x = *xi; 1000 y = *yi; 1001 w = *wi; 1002 h = *hi; 1003 1004 DSSDBG("dispc_setup_partial_planes %d,%d %dx%d\n", 1005 *xi, *yi, *wi, *hi); 1006 1007 mgr = dssdev->manager; 1008 1009 if (!mgr) { 1010 DSSDBG("no manager\n"); 1011 return; 1012 } 1013 1014 make_even(&x, &w); 1015 1016 spin_lock_irqsave(&dss_cache.lock, flags); 1017 1018 /* 1019 * Execute the outer loop until the inner loop has completed 1020 * once without increasing the update area. This will ensure that 1021 * all scaled overlays end up completely within the update area. 1022 */ 1023 do { 1024 area_changed = false; 1025 1026 /* We need to show the whole overlay if it is scaled. So look 1027 * for those, and make the update area larger if found. 1028 * Also mark the overlay cache dirty */ 1029 for (i = 0; i < num_ovls; ++i) { 1030 unsigned x1, y1, x2, y2; 1031 unsigned outw, outh; 1032 1033 oc = &dss_cache.overlay_cache[i]; 1034 1035 if (oc->channel != mgr->id) 1036 continue; 1037 1038 oc->dirty = true; 1039 1040 if (!enlarge_update_area) 1041 continue; 1042 1043 if (!oc->enabled) 1044 continue; 1045 1046 if (!dispc_is_overlay_scaled(oc)) 1047 continue; 1048 1049 outw = oc->out_width == 0 ? 1050 oc->width : oc->out_width; 1051 outh = oc->out_height == 0 ? 1052 oc->height : oc->out_height; 1053 1054 /* is the overlay outside the update region? */ 1055 if (!rectangle_intersects(x, y, w, h, 1056 oc->pos_x, oc->pos_y, 1057 outw, outh)) 1058 continue; 1059 1060 /* if the overlay totally inside the update region? */ 1061 if (rectangle_subset(oc->pos_x, oc->pos_y, outw, outh, 1062 x, y, w, h)) 1063 continue; 1064 1065 if (x > oc->pos_x) 1066 x1 = oc->pos_x; 1067 else 1068 x1 = x; 1069 1070 if (y > oc->pos_y) 1071 y1 = oc->pos_y; 1072 else 1073 y1 = y; 1074 1075 if ((x + w) < (oc->pos_x + outw)) 1076 x2 = oc->pos_x + outw; 1077 else 1078 x2 = x + w; 1079 1080 if ((y + h) < (oc->pos_y + outh)) 1081 y2 = oc->pos_y + outh; 1082 else 1083 y2 = y + h; 1084 1085 x = x1; 1086 y = y1; 1087 w = x2 - x1; 1088 h = y2 - y1; 1089 1090 make_even(&x, &w); 1091 1092 DSSDBG("changing upd area due to ovl(%d) " 1093 "scaling %d,%d %dx%d\n", 1094 i, x, y, w, h); 1095 1096 area_changed = true; 1097 } 1098 } while (area_changed); 1099 1100 mc = &dss_cache.manager_cache[mgr->id]; 1101 mc->do_manual_update = true; 1102 mc->enlarge_update_area = enlarge_update_area; 1103 mc->x = x; 1104 mc->y = y; 1105 mc->w = w; 1106 mc->h = h; 1107 1108 configure_dispc(); 1109 1110 mc->do_manual_update = false; 1111 1112 spin_unlock_irqrestore(&dss_cache.lock, flags); 1113 1114 *xi = x; 1115 *yi = y; 1116 *wi = w; 1117 *hi = h; 1118} 1119 1120void dss_start_update(struct omap_dss_device *dssdev) 1121{ 1122 struct manager_cache_data *mc; 1123 struct overlay_cache_data *oc; 1124 const int num_ovls = ARRAY_SIZE(dss_cache.overlay_cache); 1125 const int num_mgrs = ARRAY_SIZE(dss_cache.manager_cache); 1126 struct omap_overlay_manager *mgr; 1127 int i; 1128 1129 mgr = dssdev->manager; 1130 1131 for (i = 0; i < num_ovls; ++i) { 1132 oc = &dss_cache.overlay_cache[i]; 1133 if (oc->channel != mgr->id) 1134 continue; 1135 1136 oc->shadow_dirty = false; 1137 } 1138 1139 for (i = 0; i < num_mgrs; ++i) { 1140 mc = &dss_cache.manager_cache[i]; 1141 if (mgr->id != i) 1142 continue; 1143 1144 mc->shadow_dirty = false; 1145 } 1146 1147 dssdev->manager->enable(dssdev->manager); 1148} 1149 1150static void dss_apply_irq_handler(void *data, u32 mask) 1151{ 1152 struct manager_cache_data *mc; 1153 struct overlay_cache_data *oc; 1154 const int num_ovls = ARRAY_SIZE(dss_cache.overlay_cache); 1155 const int num_mgrs = ARRAY_SIZE(dss_cache.manager_cache); 1156 int i, r; 1157 bool mgr_busy[2]; 1158 1159 mgr_busy[0] = dispc_go_busy(0); 1160 mgr_busy[1] = dispc_go_busy(1); 1161 1162 spin_lock(&dss_cache.lock); 1163 1164 for (i = 0; i < num_ovls; ++i) { 1165 oc = &dss_cache.overlay_cache[i]; 1166 if (!mgr_busy[oc->channel]) 1167 oc->shadow_dirty = false; 1168 } 1169 1170 for (i = 0; i < num_mgrs; ++i) { 1171 mc = &dss_cache.manager_cache[i]; 1172 if (!mgr_busy[i]) 1173 mc->shadow_dirty = false; 1174 } 1175 1176 r = configure_dispc(); 1177 if (r == 1) 1178 goto end; 1179 1180 /* re-read busy flags */ 1181 mgr_busy[0] = dispc_go_busy(0); 1182 mgr_busy[1] = dispc_go_busy(1); 1183 1184 /* keep running as long as there are busy managers, so that 1185 * we can collect overlay-applied information */ 1186 for (i = 0; i < num_mgrs; ++i) { 1187 if (mgr_busy[i]) 1188 goto end; 1189 } 1190 1191 omap_dispc_unregister_isr(dss_apply_irq_handler, NULL, 1192 DISPC_IRQ_VSYNC | DISPC_IRQ_EVSYNC_ODD | 1193 DISPC_IRQ_EVSYNC_EVEN); 1194 dss_cache.irq_enabled = false; 1195 1196end: 1197 spin_unlock(&dss_cache.lock); 1198} 1199 1200static int omap_dss_mgr_apply(struct omap_overlay_manager *mgr) 1201{ 1202 struct overlay_cache_data *oc; 1203 struct manager_cache_data *mc; 1204 int i; 1205 struct omap_overlay *ovl; 1206 int num_planes_enabled = 0; 1207 bool use_fifomerge; 1208 unsigned long flags; 1209 int r; 1210 1211 DSSDBG("omap_dss_mgr_apply(%s)\n", mgr->name); 1212 1213 spin_lock_irqsave(&dss_cache.lock, flags); 1214 1215 /* Configure overlays */ 1216 for (i = 0; i < omap_dss_get_num_overlays(); ++i) { 1217 struct omap_dss_device *dssdev; 1218 1219 ovl = omap_dss_get_overlay(i); 1220 1221 if (!(ovl->caps & OMAP_DSS_OVL_CAP_DISPC)) 1222 continue; 1223 1224 oc = &dss_cache.overlay_cache[ovl->id]; 1225 1226 if (!overlay_enabled(ovl)) { 1227 if (oc->enabled) { 1228 oc->enabled = false; 1229 oc->dirty = true; 1230 } 1231 continue; 1232 } 1233 1234 if (!ovl->info_dirty) { 1235 if (oc->enabled) 1236 ++num_planes_enabled; 1237 continue; 1238 } 1239 1240 dssdev = ovl->manager->device; 1241 1242 if (dss_check_overlay(ovl, dssdev)) { 1243 if (oc->enabled) { 1244 oc->enabled = false; 1245 oc->dirty = true; 1246 } 1247 continue; 1248 } 1249 1250 ovl->info_dirty = false; 1251 oc->dirty = true; 1252 1253 oc->paddr = ovl->info.paddr; 1254 oc->vaddr = ovl->info.vaddr; 1255 oc->screen_width = ovl->info.screen_width; 1256 oc->width = ovl->info.width; 1257 oc->height = ovl->info.height; 1258 oc->color_mode = ovl->info.color_mode; 1259 oc->rotation = ovl->info.rotation; 1260 oc->rotation_type = ovl->info.rotation_type; 1261 oc->mirror = ovl->info.mirror; 1262 oc->pos_x = ovl->info.pos_x; 1263 oc->pos_y = ovl->info.pos_y; 1264 oc->out_width = ovl->info.out_width; 1265 oc->out_height = ovl->info.out_height; 1266 oc->global_alpha = ovl->info.global_alpha; 1267 1268 oc->replication = 1269 dss_use_replication(dssdev, ovl->info.color_mode); 1270 1271 oc->ilace = dssdev->type == OMAP_DISPLAY_TYPE_VENC; 1272 1273 oc->channel = ovl->manager->id; 1274 1275 oc->enabled = true; 1276 1277 oc->manual_update = 1278 dssdev->caps & OMAP_DSS_DISPLAY_CAP_MANUAL_UPDATE && 1279 dssdev->driver->get_update_mode(dssdev) != 1280 OMAP_DSS_UPDATE_AUTO; 1281 1282 ++num_planes_enabled; 1283 } 1284 1285 /* Configure managers */ 1286 list_for_each_entry(mgr, &manager_list, list) { 1287 struct omap_dss_device *dssdev; 1288 1289 if (!(mgr->caps & OMAP_DSS_OVL_MGR_CAP_DISPC)) 1290 continue; 1291 1292 mc = &dss_cache.manager_cache[mgr->id]; 1293 1294 if (mgr->device_changed) { 1295 mgr->device_changed = false; 1296 mgr->info_dirty = true; 1297 } 1298 1299 if (!mgr->info_dirty) 1300 continue; 1301 1302 if (!mgr->device) 1303 continue; 1304 1305 dssdev = mgr->device; 1306 1307 mgr->info_dirty = false; 1308 mc->dirty = true; 1309 1310 mc->default_color = mgr->info.default_color; 1311 mc->trans_key_type = mgr->info.trans_key_type; 1312 mc->trans_key = mgr->info.trans_key; 1313 mc->trans_enabled = mgr->info.trans_enabled; 1314 mc->alpha_enabled = mgr->info.alpha_enabled; 1315 1316 mc->manual_upd_display = 1317 dssdev->caps & OMAP_DSS_DISPLAY_CAP_MANUAL_UPDATE; 1318 1319 mc->manual_update = 1320 dssdev->caps & OMAP_DSS_DISPLAY_CAP_MANUAL_UPDATE && 1321 dssdev->driver->get_update_mode(dssdev) != 1322 OMAP_DSS_UPDATE_AUTO; 1323 } 1324 1325 use_fifomerge = false; 1326 1327 /* Configure overlay fifos */ 1328 for (i = 0; i < omap_dss_get_num_overlays(); ++i) { 1329 struct omap_dss_device *dssdev; 1330 u32 size; 1331 1332 ovl = omap_dss_get_overlay(i); 1333 1334 if (!(ovl->caps & OMAP_DSS_OVL_CAP_DISPC)) 1335 continue; 1336 1337 oc = &dss_cache.overlay_cache[ovl->id]; 1338 1339 if (!oc->enabled) 1340 continue; 1341 1342 dssdev = ovl->manager->device; 1343 1344 size = dispc_get_plane_fifo_size(ovl->id); 1345 if (use_fifomerge) 1346 size *= 3; 1347 1348 switch (dssdev->type) { 1349 case OMAP_DISPLAY_TYPE_DPI: 1350 case OMAP_DISPLAY_TYPE_DBI: 1351 case OMAP_DISPLAY_TYPE_SDI: 1352 case OMAP_DISPLAY_TYPE_VENC: 1353 default_get_overlay_fifo_thresholds(ovl->id, size, 1354 &oc->burst_size, &oc->fifo_low, 1355 &oc->fifo_high); 1356 break; 1357#ifdef CONFIG_OMAP2_DSS_DSI 1358 case OMAP_DISPLAY_TYPE_DSI: 1359 dsi_get_overlay_fifo_thresholds(ovl->id, size, 1360 &oc->burst_size, &oc->fifo_low, 1361 &oc->fifo_high); 1362 break; 1363#endif 1364 default: 1365 BUG(); 1366 } 1367 } 1368 1369 r = 0; 1370 dss_clk_enable(DSS_CLK_ICK | DSS_CLK_FCK1); 1371 if (!dss_cache.irq_enabled) { 1372 r = omap_dispc_register_isr(dss_apply_irq_handler, NULL, 1373 DISPC_IRQ_VSYNC | DISPC_IRQ_EVSYNC_ODD | 1374 DISPC_IRQ_EVSYNC_EVEN); 1375 dss_cache.irq_enabled = true; 1376 } 1377 configure_dispc(); 1378 dss_clk_disable(DSS_CLK_ICK | DSS_CLK_FCK1); 1379 1380 spin_unlock_irqrestore(&dss_cache.lock, flags); 1381 1382 return r; 1383} 1384 1385static int dss_check_manager(struct omap_overlay_manager *mgr) 1386{ 1387 /* OMAP supports only graphics source transparency color key and alpha 1388 * blending simultaneously. See TRM 15.4.2.4.2.2 Alpha Mode */ 1389 1390 if (mgr->info.alpha_enabled && mgr->info.trans_enabled && 1391 mgr->info.trans_key_type != OMAP_DSS_COLOR_KEY_GFX_DST) 1392 return -EINVAL; 1393 1394 return 0; 1395} 1396 1397static int omap_dss_mgr_set_info(struct omap_overlay_manager *mgr, 1398 struct omap_overlay_manager_info *info) 1399{ 1400 int r; 1401 struct omap_overlay_manager_info old_info; 1402 1403 old_info = mgr->info; 1404 mgr->info = *info; 1405 1406 r = dss_check_manager(mgr); 1407 if (r) { 1408 mgr->info = old_info; 1409 return r; 1410 } 1411 1412 mgr->info_dirty = true; 1413 1414 return 0; 1415} 1416 1417static void omap_dss_mgr_get_info(struct omap_overlay_manager *mgr, 1418 struct omap_overlay_manager_info *info) 1419{ 1420 *info = mgr->info; 1421} 1422 1423static int dss_mgr_enable(struct omap_overlay_manager *mgr) 1424{ 1425 dispc_enable_channel(mgr->id, 1); 1426 return 0; 1427} 1428 1429static int dss_mgr_disable(struct omap_overlay_manager *mgr) 1430{ 1431 dispc_enable_channel(mgr->id, 0); 1432 return 0; 1433} 1434 1435static void omap_dss_add_overlay_manager(struct omap_overlay_manager *manager) 1436{ 1437 ++num_managers; 1438 list_add_tail(&manager->list, &manager_list); 1439} 1440 1441int dss_init_overlay_managers(struct platform_device *pdev) 1442{ 1443 int i, r; 1444 1445 spin_lock_init(&dss_cache.lock); 1446 1447 INIT_LIST_HEAD(&manager_list); 1448 1449 num_managers = 0; 1450 1451 for (i = 0; i < 2; ++i) { 1452 struct omap_overlay_manager *mgr; 1453 mgr = kzalloc(sizeof(*mgr), GFP_KERNEL); 1454 1455 BUG_ON(mgr == NULL); 1456 1457 switch (i) { 1458 case 0: 1459 mgr->name = "lcd"; 1460 mgr->id = OMAP_DSS_CHANNEL_LCD; 1461 mgr->supported_displays = 1462 OMAP_DISPLAY_TYPE_DPI | OMAP_DISPLAY_TYPE_DBI | 1463 OMAP_DISPLAY_TYPE_SDI | OMAP_DISPLAY_TYPE_DSI; 1464 break; 1465 case 1: 1466 mgr->name = "tv"; 1467 mgr->id = OMAP_DSS_CHANNEL_DIGIT; 1468 mgr->supported_displays = OMAP_DISPLAY_TYPE_VENC; 1469 break; 1470 } 1471 1472 mgr->set_device = &omap_dss_set_device; 1473 mgr->unset_device = &omap_dss_unset_device; 1474 mgr->apply = &omap_dss_mgr_apply; 1475 mgr->set_manager_info = &omap_dss_mgr_set_info; 1476 mgr->get_manager_info = &omap_dss_mgr_get_info; 1477 mgr->wait_for_go = &dss_mgr_wait_for_go; 1478 mgr->wait_for_vsync = &dss_mgr_wait_for_vsync; 1479 1480 mgr->enable = &dss_mgr_enable; 1481 mgr->disable = &dss_mgr_disable; 1482 1483 mgr->caps = OMAP_DSS_OVL_MGR_CAP_DISPC; 1484 1485 dss_overlay_setup_dispc_manager(mgr); 1486 1487 omap_dss_add_overlay_manager(mgr); 1488 1489 r = kobject_init_and_add(&mgr->kobj, &manager_ktype, 1490 &pdev->dev.kobj, "manager%d", i); 1491 1492 if (r) { 1493 DSSERR("failed to create sysfs file\n"); 1494 continue; 1495 } 1496 } 1497 1498#ifdef L4_EXAMPLE 1499 { 1500 int omap_dss_mgr_apply_l4(struct omap_overlay_manager *mgr) 1501 { 1502 DSSDBG("omap_dss_mgr_apply_l4(%s)\n", mgr->name); 1503 1504 return 0; 1505 } 1506 1507 struct omap_overlay_manager *mgr; 1508 mgr = kzalloc(sizeof(*mgr), GFP_KERNEL); 1509 1510 BUG_ON(mgr == NULL); 1511 1512 mgr->name = "l4"; 1513 mgr->supported_displays = 1514 OMAP_DISPLAY_TYPE_DBI | OMAP_DISPLAY_TYPE_DSI; 1515 1516 mgr->set_device = &omap_dss_set_device; 1517 mgr->unset_device = &omap_dss_unset_device; 1518 mgr->apply = &omap_dss_mgr_apply_l4; 1519 mgr->set_manager_info = &omap_dss_mgr_set_info; 1520 mgr->get_manager_info = &omap_dss_mgr_get_info; 1521 1522 dss_overlay_setup_l4_manager(mgr); 1523 1524 omap_dss_add_overlay_manager(mgr); 1525 1526 r = kobject_init_and_add(&mgr->kobj, &manager_ktype, 1527 &pdev->dev.kobj, "managerl4"); 1528 1529 if (r) 1530 DSSERR("failed to create sysfs file\n"); 1531 } 1532#endif 1533 1534 return 0; 1535} 1536 1537void dss_uninit_overlay_managers(struct platform_device *pdev) 1538{ 1539 struct omap_overlay_manager *mgr; 1540 1541 while (!list_empty(&manager_list)) { 1542 mgr = list_first_entry(&manager_list, 1543 struct omap_overlay_manager, list); 1544 list_del(&mgr->list); 1545 kobject_del(&mgr->kobj); 1546 kobject_put(&mgr->kobj); 1547 kfree(mgr); 1548 } 1549 1550 num_managers = 0; 1551} 1552 1553int omap_dss_get_num_overlay_managers(void) 1554{ 1555 return num_managers; 1556} 1557EXPORT_SYMBOL(omap_dss_get_num_overlay_managers); 1558 1559struct omap_overlay_manager *omap_dss_get_overlay_manager(int num) 1560{ 1561 int i = 0; 1562 struct omap_overlay_manager *mgr; 1563 1564 list_for_each_entry(mgr, &manager_list, list) { 1565 if (i++ == num) 1566 return mgr; 1567 } 1568 1569 return NULL; 1570} 1571EXPORT_SYMBOL(omap_dss_get_overlay_manager); 1572